WO2016158953A1 - 高周波フィルタ、フロントエンド回路、および通信機器 - Google Patents

高周波フィルタ、フロントエンド回路、および通信機器 Download PDF

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Publication number
WO2016158953A1
WO2016158953A1 PCT/JP2016/060131 JP2016060131W WO2016158953A1 WO 2016158953 A1 WO2016158953 A1 WO 2016158953A1 JP 2016060131 W JP2016060131 W JP 2016060131W WO 2016158953 A1 WO2016158953 A1 WO 2016158953A1
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Prior art keywords
resonator
terminal
circuit
high frequency
filter
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PCT/JP2016/060131
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English (en)
French (fr)
Japanese (ja)
Inventor
塚本秀樹
谷将和
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株式会社村田製作所
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Priority to JP2017510024A priority Critical patent/JP6390787B2/ja
Priority to KR1020177027529A priority patent/KR101980033B1/ko
Priority to CN201680019351.4A priority patent/CN107408937B/zh
Publication of WO2016158953A1 publication Critical patent/WO2016158953A1/ja
Priority to US15/718,330 priority patent/US10200012B2/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6403—Programmable filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/0004—Impedance-matching networks
    • H03H9/0009—Impedance-matching networks using surface acoustic wave devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6406—Filters characterised by a particular frequency characteristic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • H03H9/6433—Coupled resonator filters
    • H03H9/6483—Ladder SAW filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/703—Networks using bulk acoustic wave devices
    • H03H9/706—Duplexers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/72—Networks using surface acoustic waves
    • H03H9/725—Duplexers

Definitions

  • the present invention relates to a high-frequency filter, a front-end circuit, and a communication device using a resonance frequency and an anti-resonance frequency of a resonator.
  • variable frequency filter By using a variable frequency filter, it can be applied to a plurality of filter characteristics (pass characteristics and attenuation characteristics) corresponding to different pass bands with one high frequency filter.
  • the frequency variable filter described in Patent Document 1 includes a plurality of piezoelectric resonators and switches.
  • the combination of piezoelectric resonators is varied by switching the connection mode of the switches. Thereby, a plurality of different pass characteristics (attenuation characteristics) are realized.
  • an object of the present invention is to provide a high-frequency filter having good isolation characteristics while being downsized by forming two attenuation poles with one switch.
  • the high-frequency filter of the present invention includes first, second, and third resonators, a first reactance element, and a switch.
  • the first resonator is connected between the first input / output terminal and the second input / output terminal.
  • One end of the first reactance element is connected between the first resonator and the first input / output terminal.
  • One end of the second resonator is connected to the other end of the first reactance element.
  • the switch selects one of a connection portion between the first reactance element and the second resonator and a third resonator, and selects the selected connection portion or the third resonator and the first resonator in the first resonator. 2 Connect the terminal on the input / output terminal side.
  • the second resonator and the third resonator are connected to the ground.
  • the second resonator and the third resonator are so-called shunt-connected resonators connected between the transmission line connecting the first input / output terminal and the second input / output terminal and the ground. .
  • This makes it possible to realize a wider variety of filter characteristics than a circuit that does not use a shunt-connected resonator.
  • the switch may be connected to the ground on the unselected side.
  • the high frequency filter of the present invention may include a second reactance element connected in parallel to the third resonator.
  • the high frequency filter of the present invention may further include a fourth resonator and a third reactance element.
  • the fourth resonator is connected between a connection portion between the first resonator and the switch and the second input / output terminal.
  • the third reactance element is connected between a connection portion between the first reactance element and the second resonator and the second input / output terminal.
  • the first reactance element may be an inductor or a capacitor.
  • various filter characteristics can be realized.
  • an inductor it is possible to select an aspect in which the inductor is used for shifting the antiresonance point of the resonator, a circuit in which the inductor is simply used as a matching circuit, and the like, and more various filter characteristics can be realized.
  • a capacitor it is possible to select a mode in which the capacitor is used for shifting the antiresonance point of the resonator, a mode in which the capacitor is simply used as a matching circuit, and the like, and more various filter characteristics can be realized.
  • the first reactance element, the second reactance element, and the third reactance element may be inductors.
  • the first reactance element and the third reactance element may be capacitors.
  • the high frequency filter of the present invention corresponds to the first communication band and the second communication band having a higher center frequency than the first communication band and the communication band partially overlapping the first communication band.
  • One terminal and a second terminal are provided.
  • the high frequency filter includes a ladder-type resonance circuit and an attenuation circuit.
  • the ladder-type resonance circuit is disposed between the first terminal and the second terminal, and includes at least one or more series arm resonators and at least one or more parallel arm resonators.
  • the attenuation circuit is connected to a connection node between the ladder-type resonance circuit and the second terminal.
  • the attenuation circuit includes a resonator and a switch. The resonator has one end connected to the first selected terminal of the switch and the other end connected to the ground potential.
  • the switch is connected to the first selected terminal connected to the resonator and the ground potential.
  • a second selected terminal and a common terminal selectively connected to the first selected terminal or the second selected terminal and connected to the connection node.
  • the high frequency filter has a state corresponding to the second communication band in which the common terminal and the first selected terminal in the switch are connected, and a first communication band in which the common terminal and the second selected terminal in the switch are connected. Switch between corresponding states.
  • filter characteristics corresponding to each of a plurality of communication bands with overlapping communication bands can be realized with a configuration using one switch.
  • the high-frequency filter according to the present invention may further include a longitudinally coupled resonant circuit in which a plurality of resonators are longitudinally coupled, and the longitudinally coupled resonant circuit may be connected in series to a ladder-type resonant circuit.
  • filter characteristics corresponding to each of a plurality of communication bands with overlapping communication bands can be realized with a configuration using one switch.
  • the front end circuit of the present invention includes a branching circuit, a transmission side amplification circuit, and a reception side amplification circuit.
  • the demultiplexing circuit includes a transmission filter that filters a transmission signal and a reception filter that filters a reception signal.
  • the transmission side amplification circuit is connected to the transmission filter, and the reception side amplification circuit is connected to the reception filter. At least one of the transmission filter and the reception filter is any one of the high-frequency filters described above.
  • This configuration enables low-loss communication in the specified communication band and satisfies spurious emission regulations.
  • the communication device of the present invention includes the above-described front end circuit, and an RFIC that is connected to the transmission side amplification circuit and the reception side amplification circuit and generates a switch control signal.
  • This configuration enables low-loss communication in a plurality of selectable communication bands and satisfies spurious emission regulations.
  • FIG. 3 is an equivalent circuit diagram of a switch in the high frequency filter according to the first embodiment of the present invention.
  • (A) is an equivalent circuit diagram in the 1st connection mode in the high frequency filter concerning a 1st embodiment of the present invention
  • (B) is the 2nd in a high frequency filter concerning a 1st embodiment of the present invention.
  • (A) is a graph which shows the filter characteristic in the high frequency filter which concerns on the 1st Embodiment of this invention
  • (B) is the impedance characteristic of the resonator in the high frequency filter which concerns on the 1st Embodiment of this invention.
  • (A) is a graph which shows the filter characteristic in the high frequency filter which concerns on the 3rd Embodiment of this invention
  • (B) is the impedance characteristic of the resonator in the high frequency filter which concerns on the 3rd Embodiment of this invention. It is a graph which shows the damping characteristic based on.
  • (A) is an equivalent circuit diagram in the 1st connection mode in the high frequency filter concerning a 4th embodiment of the present invention
  • (B) is the 2nd in a high frequency filter concerning a 4th embodiment of the present invention. It is an equivalent circuit diagram in a connection mode.
  • (A) is a graph which shows the filter characteristic in the high frequency filter which concerns on the 4th Embodiment of this invention
  • (B) is the impedance characteristic of the resonator in the high frequency filter which concerns on the 4th Embodiment of this invention. It is a graph which shows the damping characteristic based on.
  • It is a circuit diagram of the high frequency filter concerning a 5th embodiment of the present invention.
  • (A) is an equivalent circuit diagram in the 1st connection mode in the high frequency filter concerning a 5th embodiment of the present invention
  • (B) is the 2nd in a high frequency filter concerning a 5th embodiment of the present invention. It is an equivalent circuit diagram in a connection mode.
  • FIG. 10 is a circuit diagram of a branching circuit according to a seventh embodiment of the present invention. It is a graph which shows the filter characteristic of the transmission filter of the branching circuit which concerns on the 7th Embodiment of this invention.
  • FIG. 10 is a circuit diagram of a branching circuit according to an eighth embodiment of the present invention. It is a functional block diagram of the communication apparatus which concerns on the 9th Embodiment of this invention.
  • FIG. 1 is a circuit diagram of a high frequency filter according to a first embodiment of the present invention.
  • FIG. 2 is an equivalent circuit diagram of a switch in the high frequency filter according to the first embodiment of the present invention.
  • FIG. 3A is an equivalent circuit diagram in the first connection mode in the high-frequency filter according to the first embodiment of the present invention.
  • FIG. 3B is an equivalent circuit diagram in the second connection mode in the high-frequency filter according to the first embodiment of the present invention.
  • FIG. 4A is a graph showing filter characteristics in the high-frequency filter according to the first embodiment of the present invention.
  • FIG. 4B is a graph showing attenuation characteristics based on the impedance characteristics of the resonator in the high-frequency filter according to the first embodiment of the present invention.
  • the high-frequency filter 10 includes resonators 21 (“first resonator” of the present invention), 31 (“second resonator” of the present invention), and 32 (“third resonator of the present invention”). ”), An inductor 41 (“ first reactance element ”of the present invention), and a switch 51.
  • the resonators 21, 31, and 32 are resonators having a resonance point (resonance frequency) and an antiresonance point (antiresonance frequency), and are, for example, piezoelectric resonators.
  • the resonance points and antiresonance points of the resonators 21, 31, and 32 are appropriately set according to the filter characteristics desired for the high frequency filter 10.
  • the switch 51 is an SPDT switch including terminals PSW0, PSW1, and PSW2. Terminal PSW0 is selectively connected to terminal PSW1 or terminal PSW2. More specifically, as shown in FIG. 2, the switch 51 includes four SPST switches. One ends of the SPST switches F1 and F2 are connected to the terminal PSW0. The other end of the SPST switch F1 is connected to the terminal PSW1 and to one end of the SPST switch F3. The other end of the SPST switch F3 is connected to the ground. The other end of the SPST switch F2 is connected to the terminal PSW2 and to one end of the SPST switch F4. The other end of the SPST switch F4 is connected to the ground. As shown in FIG.
  • the SPST switches F1 and F4 are conductive, the SPST switches F2 and F3 are opened. As shown in FIG. 2B, if the SPST switches F1, F4 are open, the SPST switches F2, F3 become conductive. With such a configuration, in the switch 51, if the terminal PSW0 and the terminal PSW1 are conductive, the terminal PSW2 is disconnected from the terminal PSW0 and connected to the ground. If the terminal PSW0 and the terminal PSW2 are conductive, the terminal PSW1 is disconnected from the terminal PSW0 and connected to the ground.
  • the resonator 21 is connected between the first input / output terminal P1 and the second input / output terminal P2.
  • One end of the inductor 41 is connected to the first input / output terminal P1.
  • one end of the inductor 41 is connected to the terminal on the first input / output terminal P1 side of the resonator 21.
  • the terminal PSW0 of the switch 51 is connected to the second input / output terminal P2.
  • the terminal PSW0 of the switch 51 is connected to the terminal on the second input / output terminal P2 side of the resonator 21.
  • the terminal PSW1 of the switch 51 is connected to the other end of the inductor 41.
  • the terminal PSW1 of the switch 51 is connected to one end of the resonator 31.
  • the other end of the resonator 31 is connected to the ground.
  • a terminal PSW ⁇ b> 2 of the switch 51 is connected to one end of the resonator 32.
  • the other end of the resonator 32 is connected to the ground.
  • the high frequency filter 10 functions as one of the two types of circuits shown in FIGS. 3A and 3B by switching the connection mode of the switch 51.
  • connection mode 1 In the high frequency filter 10 (1) realized in the connection mode 1, the terminal PSW0 is connected to the terminal PSW1.
  • This connection mode 1 has the circuit configuration of FIG. Specifically, a parallel circuit of the resonator 21 and the inductor 41 is connected between the first input / output terminal P1 and the second input / output terminal P2. The second input / output terminal P2 side of the parallel circuit is connected to the ground via the resonator 31.
  • the inductor 41 functions as a so-called elongated L (inductor) for the resonator 21.
  • the pass band BW (101) is formed by a frequency near the resonance point of the parallel circuit of the resonator 21 and the inductor 41, a frequency band on the high frequency side, and a frequency band on the higher frequency side than the antiresonance point of the resonator 31. ing.
  • the end (lower limit frequency) on the low frequency side of the pass band BW (101) is lower than the resonance point of the parallel circuit of the resonator 21 and the inductor 41 of the resonator 31 existing on the low frequency side. It is determined by the antiresonance point.
  • the frequency side higher than the lower limit frequency of the pass band BW (101) is determined by the characteristics of the parallel circuit of the resonator 21 and the inductor 41 and the characteristics of the resonator 31.
  • the filter characteristic AT (101) has two attenuation poles on the low frequency side of the passband BW (101). This attenuation pole is determined by the frequency f3 of the resonance point of the resonator 31 and the frequency f4 of the antiresonance point of the parallel circuit of the resonator 21 and the inductor 41, respectively.
  • the impedance characteristics of the resonator 31 are close to the resonance point and the antiresonance point, and the frequency f3 of the resonance point of the resonator 31 is close to the lower limit frequency of the passband BW (101). ing.
  • the low frequency side of the pass band BW (101) can realize a steep attenuation characteristic and can obtain an attenuation pole at the frequency f3.
  • the inductor 41 functions as an extension inductor of the resonator 21, and the frequency f4 of the anti-resonance point (sub-anti-resonance point) of the parallel circuit of the resonator 21 and the inductor 41 is resonant. Close to the resonance point of the child 31. Thereby, the frequency f4 of the antiresonance point (sub antiresonance point) of the parallel circuit of the resonator 21 and the inductor 41 can be brought close to the frequency f3 of the resonance point of the resonator 31. Therefore, an attenuation pole having the frequency f4 can be further obtained in the vicinity of the attenuation pole having the frequency f3.
  • the attenuation characteristic on the low frequency side of the passband BW (101) is steep, and the filter characteristic AT (101) having two attenuation poles can be realized.
  • the attenuation amount on the low frequency side of the passband BW (101) can be further increased. Thereby, more reliable isolation can be ensured in the frequency band close to the low frequency side of the pass band BW (101).
  • connection mode 2 In the high frequency filter 10 (2) realized in the connection mode 2, the terminal PSW0 is connected to the terminal PSW2. The terminal PSW1 is connected to the ground.
  • This connection mode 2 has the circuit configuration of FIG. Specifically, the resonator 21 is connected between the first input / output terminal P1 and the second input / output terminal P2. The first input / output terminal P1 side of the resonator 21 is connected to the ground via the inductor 41. The second input / output terminal P2 side of the resonator 21 is connected to the ground via the resonator 32. In this configuration, the inductor 41 functions as a matching circuit on the first input / output terminal P1 side with respect to the circuit including the resonators 21 and 32. That is, it is not a main factor for determining the filter characteristics.
  • the pass band BW (102) is located on the lower frequency side than the pass band BW (101) and partially overlaps.
  • the pass band BW (102) is formed by a frequency band on the higher frequency side than the antiresonance point of the resonator 32 and a frequency band on the lower frequency side than the resonance point of the resonator 21.
  • the end (lower limit frequency) on the low frequency side of the pass band BW (102) is determined by the antiresonance point of the resonator 32.
  • the end (upper limit frequency) on the high frequency side of the pass band BW (102) is determined by the resonator 21.
  • the filter characteristic AT (102) has one attenuation pole on the low frequency side of the passband BW (102) and one attenuation pole on the high frequency side.
  • the attenuation pole on the low frequency side is formed by the frequency f2 of the resonance point of the resonator 32.
  • the attenuation pole on the high frequency side is formed by the frequency f1 of the antiresonance point of the resonator 21.
  • the resonators 21 and 32 do not include an elongated inductor, and the antiresonance point and the resonance point are close to each other.
  • the pass band BW (102) a steep attenuation characteristic due to the characteristic of the resonator 32 can be realized, and an attenuation pole can be obtained at the frequency f2.
  • a steep attenuation characteristic due to the characteristic of the resonator 21 can be realized, and an attenuation pole can be obtained at the frequency f1.
  • connection mode 2 it is possible to realize the filter characteristic AT (102) in which the attenuation characteristics on the low frequency side and the high frequency side of the passband BW (102) are steep.
  • attenuation poles can be provided on both the low frequency side and the high frequency side of the passband BW (102).
  • isolation can be ensured in both the low frequency side and the frequency band close to the high frequency side of the pass band BW (102).
  • the configuration of the present embodiment As described above, by using the configuration of the present embodiment, more reliable isolation can be ensured in the frequency band close to the low frequency side and / or the high frequency side of the pass band BW. That is, by using the configuration of the present embodiment, two types of filter characteristics having different passbands and different attenuation characteristics can be realized. These filter characteristics can select the function of the inductor 41 along with the switching of the resonator by making the inductor 41 the selection target of the switch 51 used for switching the resonator. Therefore, a small circuit configuration can be realized.
  • the high frequency filter of the present embodiment is effective for use of the communication band Band28 of the communication standard 3GPP2.
  • the communication band Band28 a plurality of communication bands Band28A and Band28B are set.
  • the frequency band of the communication band Band 28A and the frequency band of the communication band Band 28B partially overlap.
  • the transmission frequency band of the communication band Band 28 is from 703 [MHz] to 748 [MHz].
  • the transmission frequency band of the communication band Band 28A is from 703 [MHz] to 733 [MHz], and the transmission frequency band of the communication band Band 28B is from 718 [MHz] to 748 [MHz].
  • the transmission frequency band of the communication band Band28 overlaps with the broadcast frequency band of DTV (digital television broadcasting) and is subject to spurious emission regulation.
  • the communication band Band 28A is subject to restriction of “NS17” spurious emissions in 3GGP2, and the communication band Band 28A cannot be used in the broadcast area of the DTV signal to which this restriction is applied. Therefore, in this broadcasting area, the communication band Band 28B is designated for communication.
  • the communication terminal must pass the transmission signal of the communication band Band 28B with low loss, and at the same time satisfy the regulation of the spurious emission of “NS17” set in the frequency band of the communication band Band 28A.
  • the communication band Band 28A can also be used outside this broadcasting region. That is, the entire frequency band of the communication band Band 28 can be used. However, another spurious emission regulation “NS18” is set near the low frequency side of the communication band Band28. In this case, the communication terminal must pass the transmission signal of the communication band Band 28 with low loss, and at the same time satisfy the spurious emission regulation of “NS18” set near the low frequency side of the communication band Band 28.
  • the high-frequency filter 10 As described above, by using the high-frequency filter 10, it is possible to realize filter processing of both the communication band Band 28A and the communication band Band 28B with one high-frequency filter.
  • FIG. 5 is an equivalent circuit diagram in the second connection mode in the high-frequency filter according to the second embodiment of the present invention.
  • the high frequency filter 10A according to the present embodiment is different from the high frequency filter 10 according to the first embodiment in the configuration of the switch 51.
  • the terminal PSW2 when the terminal PSW1 is connected to the terminal PSW0 and the terminal PSW1 when the terminal PSW2 is connected to the terminal PSW0 are not connected to the ground.
  • high-frequency filter 10A has the same circuit configuration as high-frequency filter 10 according to the first embodiment.
  • the inductor 41 functions as an elongated inductor connected in parallel to the resonator 21.
  • the high-frequency filter 10A has a resonator 21 connected between the first input / output terminal P1 and the second input / output terminal P2.
  • the first input / output terminal P1 side of the resonator 21 is connected to the ground through a series circuit of an inductor 41 and a resonator 31.
  • the second input / output terminal P2 side of the resonator 21 is connected to the ground via the resonator 32.
  • the inductor 41 functions as an elongated inductor connected in series to the resonator 31.
  • the function of the switch can be changed together with the combination of the resonators by switching the switch.
  • FIG. 6 is a circuit diagram of a high-frequency filter according to the third embodiment of the present invention.
  • FIG. 7A is an equivalent circuit diagram in the first connection mode in the high-frequency filter according to the third embodiment of the present invention.
  • FIG. 7B is an equivalent circuit diagram in the second connection mode in the high-frequency filter according to the third embodiment of the present invention.
  • FIG. 8A is a graph showing filter characteristics in the high-frequency filter according to the third embodiment of the present invention.
  • FIG. 8B is a graph showing attenuation characteristics based on the impedance characteristics of the resonator in the high-frequency filter according to the third embodiment of the present invention.
  • the high frequency filter 10B according to the present embodiment is different from the high frequency filter 10 according to the first embodiment in that an inductor 42 (“second reactance element” of the present invention) is added. .
  • the inductor 42 is connected in parallel to the resonator 32.
  • the high-frequency filter 10B functions as one of the two types of circuits shown in FIGS.
  • the high frequency filter 10B (1) realized in the connection mode 1 has the same circuit configuration as the high frequency filter 10 (1) according to the first embodiment. Therefore, as shown in FIG. 8A, the filter characteristic AT (101B) of the high frequency filter 10B (1) is the same as the filter characteristic AT (101) of the high frequency filter 10 (1).
  • connection mode 2 In the high frequency filter 10 ⁇ / b> B (2) realized in the connection mode 2, the inductor 42 functions as a so-called extension L (inductor) with respect to the resonator 32.
  • the pass band BW (102B) is formed by a frequency band on the lower frequency side than the resonance point of the resonator 21, and a frequency band on the lower frequency side than the anti-resonance point of the parallel circuit of the resonator 32 and the inductor 42.
  • the end portion (upper limit frequency) on the high frequency side of the pass band BW (102B) is determined by the resonance point of the resonator 21.
  • the frequency lower than the upper limit frequency of the pass band BW (102B) is determined by the characteristics of the resonator 21 and the characteristics of the parallel circuit of the resonator 32 and the inductor 41.
  • the filter characteristic AT (102B) has two attenuation poles on the high frequency side of the pass band BW (102B).
  • the attenuation pole is determined by the frequency f1B of the antiresonance point of the resonator 21 and the frequency f2B of the resonance point of the parallel circuit of the resonator 32 and the inductor 42, respectively.
  • the impedance characteristics of the resonator 21 are close to the resonance point and the antiresonance point, and the frequency f1B of the antiresonance point of the resonator 21 is close to the upper limit frequency of the passband BW (102B). is doing.
  • the high frequency side of the pass band BW (102B) can realize a steep attenuation characteristic, and can obtain an attenuation pole at the frequency f1B.
  • the inductor 42 functions as an extension inductor of the resonator 32, and the frequency f 2 B of the resonance point of the parallel circuit of the resonator 32 and the inductor 42 is the antiresonance point of the resonator 21. Close and on the low frequency side. Thereby, the frequency f2B of the resonance point of the parallel circuit of the resonator 32 and the inductor 42 can be brought close to the frequency f1B of the resonance point of the resonator 21. Therefore, an attenuation pole having the frequency f2B can be further obtained in the vicinity of the attenuation pole having the frequency f1B.
  • the attenuation characteristic on the high frequency side of the passband BW (102B) is steep, and the filter characteristic AT (102B) having two attenuation poles can be realized.
  • the attenuation amount on the high frequency side of the pass band BW (102B) can be further increased. Thereby, more reliable isolation can be ensured in the frequency band close to the high frequency side of the pass band BW (102B).
  • high isolation can be secured on the communication band BW (102B) side in the communication band BW (101B), and the communication band BW in the communication band BW (102B).
  • High isolation on the (101B) side can be secured.
  • the high frequency filter 10B it is possible to secure higher isolation between communication bands using two adjacent pass bands. If this configuration is used, it is more effective when, for example, the bands Bnad 28A and 28B of the 3GS communication standard are both transmitted and received.
  • FIG. 9 is a circuit diagram of a high-frequency filter according to the fourth embodiment of the present invention.
  • FIG. 10A is an equivalent circuit diagram in the first connection mode in the high-frequency filter according to the fourth embodiment of the present invention.
  • FIG. 10B is an equivalent circuit diagram in the second connection mode in the high-frequency filter according to the fourth embodiment of the present invention.
  • FIG. 11A is a graph showing filter characteristics in the high-frequency filter according to the fourth embodiment of the present invention.
  • FIG. 11B is a graph showing attenuation characteristics based on the impedance characteristics of the resonator in the high-frequency filter according to the fourth embodiment of the present invention.
  • the high-frequency filter 10C according to the present embodiment is different from the high-frequency filter 10B according to the third embodiment in that the resonator 22 (the “fourth resonator” in the present invention) and the inductor 43 (the “third reactance element in the present invention”). )) Is added.
  • the resonator 22 is connected between a connection point between the resonator 21 and the switch 51 and the second input / output terminal P2.
  • One end of the inductor 43 is connected to the second input / output terminal P2.
  • one end of the inductor 43 is connected to the second input / output terminal P ⁇ b> 2 side of the resonator 22.
  • the other end of the inductor 43 is connected to the terminal PSW1 of the switch 51.
  • the other end of the inductor 43 is connected to the inductor 41 and the resonator 31.
  • the characteristics of the resonators 21, 22, 31, and 32 and the inductances of the inductors 41, 42, and 43 are appropriately set so as to realize the following two types of filter characteristics.
  • the high frequency filter 10C functions as one of the two types of circuits shown in FIGS. 10 (A) and 10 (B).
  • the high frequency filter 10C (1) realized in the connection mode 1 includes a first parallel circuit including the resonator 21 and the inductor 41, and a second parallel circuit including the resonator 22 and the inductor 43. Is provided. The first parallel circuit and the second parallel circuit are connected in series between the first input / output terminal P1 and the second input / output terminal P2. A connection point between the first parallel circuit and the second parallel circuit is connected to the ground via the resonator 31.
  • the inductor 41 functions as an extension inductor for the resonator 21.
  • the inductor 43 functions as an extension inductor for the resonator 22.
  • the high frequency filter 10C (1) can realize the filter characteristic AT (101C) shown in FIG.
  • the filter characteristic AT (101C) has a pass band BW (101C), and has three attenuation poles (frequencies f3, f4, and f6) on the low frequency side of the pass band BW (101C).
  • These passbands BW (101C) and frequencies f3, f4, and f6 are based on the same principle as in the above-described embodiments, as shown in FIG. 11B, a first parallel circuit including a resonator 21 and an inductor 41, This is determined by the characteristics of the second parallel circuit including the resonator 22 and the inductor 43 and the resonator 31.
  • the high frequency filter 10 ⁇ / b> C (2) realized in the connection mode 2 includes resonators 21 and 22, and a third parallel circuit including the resonator 32 and the inductor 42.
  • the resonators 21 and 22 are connected in series between the first input / output terminal P1 and the second input / output terminal P2.
  • a connection point between the resonator 21 and the resonator 22 is connected to the ground via a third parallel circuit.
  • the inductor 41 functions as a matching circuit on the first input / output terminal P1 side in the high-frequency filter 10C (2).
  • the inductor 43 functions as a matching circuit on the second input / output terminal P2 side in the high frequency filter 10C (2).
  • the high frequency filter 10C (2) can realize the filter characteristic AT (102C) shown in FIG.
  • the filter characteristic AT (102C) has a pass band BW (102C).
  • the pass band BW (102C) is on the lower frequency side of the pass band BW (101C) and partially overlaps the pass band BW (101C).
  • the filter characteristic AT (102C) has three attenuation poles (frequencies f1C, f2C, and f5) on the high frequency side of the passband BW (102C).
  • These passbands BW (102C) and frequencies f1C, f2C, and f5 are based on the same principle as in each of the above-described embodiments, as shown in FIG. It is determined by the characteristic of the third resonance circuit by the inductor 42.
  • the communication band BW (102C) side can be further isolated in the communication band BW (101C), and the communication band BW (102C) has a communication band. Further higher isolation on the BW (101C) side can be secured.
  • the high-frequency filter 10C it is possible to secure higher isolation between communication bands using two adjacent pass bands. Further, the number of attenuation poles arranged adjacent to each other on the frequency axis increases, so that the frequency band where large attenuation can be obtained can be widened. Thereby, the desired isolation can be more reliably realized.
  • FIG. 12 is a circuit diagram of a high-frequency filter according to the fifth embodiment of the present invention.
  • FIG. 13A is an equivalent circuit diagram in the first connection mode in the high-frequency filter according to the fifth embodiment of the present invention.
  • FIG. 13B is an equivalent circuit diagram in the second connection mode in the high-frequency filter according to the fifth embodiment of the present invention.
  • FIG. 14 is a graph showing filter characteristics of the high-frequency filter according to the fifth embodiment of the present invention.
  • the high-frequency filter 10D according to this embodiment is different from the high-frequency filter 10 according to the first embodiment in that an inductor 41 is replaced with a capacitor 61.
  • One end of the capacitor 61 is connected to the first input / output terminal P1.
  • one end of the capacitor 61 is connected to the terminal on the first input / output terminal P1 side of the resonator 21.
  • the other end of the capacitor 61 is connected to the terminal PSW1 of the switch 51.
  • This capacitor 61 corresponds to the “first reactance element” of the present invention.
  • connection mode 1 In the high frequency filter 10D (1) realized in the connection mode 1, the terminal PSW0 is connected to the terminal PSW1.
  • the circuit configuration of FIG. Specifically, a parallel circuit of the resonator 21 and the capacitor 61 is connected between the first input / output terminal P1 and the second input / output terminal P2.
  • the second input / output terminal P2 side of the parallel circuit is connected to the ground via the resonator 31.
  • the capacitor 61 has a function of shifting the antiresonance frequency of the resonator 21 to the low frequency side.
  • the filter characteristic AT (101D) indicated by the broken line in FIG. 14 is obtained.
  • the filter characteristic AT (101D) has a pass band BW (101D), and has an attenuation band on the high frequency side of the pass band BW (101D).
  • the pass band BW (101D) is formed by a frequency near the resonance point of the parallel circuit of the resonator 21 and the capacitor 61, a frequency band on the low frequency side, and a frequency band on the lower frequency side than the antiresonance point of the resonator 31. ing.
  • the end (upper limit frequency) of the high frequency side of the pass band BW (101D) is determined by the resonance point of the parallel circuit of the resonator 21 and the capacitor 61 and the antiresonance point of the resonator 31. Yes.
  • the resonance point of the parallel circuit of the resonator 21 and the capacitor 61 and the antiresonance point of the resonator 31 are substantially the same.
  • the frequency lower than the upper limit frequency of the pass band BW (101D) is determined by the characteristics of the parallel circuit of the resonator 21 and the capacitor 61 and the characteristics of the resonator 31.
  • the filter characteristic AT (101D) has one attenuation pole on the high frequency side of the passband BW (101D).
  • This attenuation pole is determined by the frequency f2D which is the frequency of the antiresonance point of the parallel circuit of the resonator 21 and the capacitor 61. That is, the anti-resonance point of the resonator 21 is shifted by the capacitor 61, and the frequency f2D of the attenuation pole is determined.
  • connection mode 2 In the high frequency filter 10D (2) realized in the connection mode 2, the terminal PSW0 is connected to the terminal PSW2. The terminal PSW1 is connected to the ground.
  • This connection mode 2 has the circuit configuration of FIG. Specifically, the resonator 21 is connected between the first input / output terminal P1 and the second input / output terminal P2. The first input / output terminal P ⁇ b> 1 side of the resonator 21 is connected to the ground via the capacitor 61. The second input / output terminal P2 side of the resonator 21 is connected to the ground via the resonator 32.
  • the capacitor 61 functions as a matching circuit on the first input / output terminal P1 side with respect to the circuit including the resonators 21 and 32. That is, it is not a main factor for determining the filter characteristics.
  • the filter characteristic AT (102D) indicated by the solid line in FIG. 14 is obtained.
  • the filter characteristic AT (102D) has a pass band BW (102D), and has attenuation bands on the high frequency side and the low frequency side of the pass band BW (102D).
  • the pass band BW (102D) is on the higher frequency side than the pass band BW (101D) and partially overlaps.
  • the pass band BW (102D) is formed by a frequency band on the higher frequency side than the antiresonance point of the resonator 32 and a frequency band on the lower frequency side than the resonance point of the resonator 21.
  • the end (lower limit frequency) on the low frequency side of the pass band BW (102D) is determined by the antiresonance point of the resonator 32.
  • An end (upper limit frequency) on the high frequency side of the pass band BW (102D) is determined by the resonance point of the resonator 21.
  • the filter characteristic AT (102D) has one attenuation pole on the low frequency side of the passband BW (102D) and one attenuation pole on the high frequency side.
  • the attenuation pole on the low frequency side is formed by the frequency f3D of the resonance point of the resonator 32.
  • the attenuation pole on the high frequency side is formed by the frequency f1D of the antiresonance point of the resonator 21.
  • FIG. 15 is a circuit diagram of a high frequency filter according to the sixth embodiment of the present invention.
  • the high frequency filter 10E according to the present embodiment is different from the high frequency filter 10C according to the fourth embodiment in that the inductors 41 and 43 are changed to capacitors 61 and 63 and the inductor 42 is deleted.
  • the high frequency filter 10E is different from the high frequency filter 10D according to the fifth embodiment in that a resonator 22 and a capacitor 63 are added.
  • the resonator 22 is connected between a connection point between the resonator 21 and the switch 51 and the second input / output terminal P2.
  • One end of the capacitor 63 is connected to the second input / output terminal P2.
  • one end of the capacitor 63 is connected to the second input / output terminal P ⁇ b> 2 side of the resonator 22.
  • the other end of the capacitor 63 is connected to the terminal PSW1 of the switch 51.
  • the other end of the capacitor 63 is connected to the capacitor 61 and the resonator 31.
  • This capacitor 63 corresponds to the “third reactance element” of the present invention.
  • the capacitor 61 as in the case where the inductor 41 of the high frequency filter 10 according to the first embodiment is changed to the capacitor 61 of the high frequency filter 10D according to the fifth embodiment.
  • the function of the capacitor can be changed according to 63 connection modes, and various filter characteristics can be realized.
  • FIG. 16 is a circuit diagram of a branching circuit according to the seventh embodiment of the present invention.
  • the branching circuit 72 includes a transmission filter 721 and a reception filter 722.
  • the branching circuit 72 includes a common terminal P11, a transmission terminal P12, and a reception terminal P13.
  • the transmission filter 712 is connected between the common terminal P11 and the transmission terminal P12.
  • the reception filter 722 is connected between the common terminal P11 and the reception terminal P13.
  • the common terminal P11 corresponds to the “first terminal” of the present invention
  • the transmission terminal P12 corresponds to the “second terminal” of the present invention.
  • the transmission filter 712 is a circuit in which a ladder-type resonance circuit 7211 in which a plurality of series arm resonators and a plurality of parallel arm resonators are connected in a ladder shape and the high-frequency filter 10B shown in the third embodiment are combined. is there. Specifically, the ladder circuit 7211 and the high frequency filter 10B are connected so that the resonator closest to the transmission terminal P12 side in the ladder circuit 7211 becomes the resonator 21 of the high frequency filter 10B.
  • This transmission filter also corresponds to the “high frequency filter” of the present invention.
  • the reception filter 722 is a combination of a ladder type resonance circuit in which a plurality of series arm resonators and a plurality of parallel arm resonators are connected in a ladder shape, and a longitudinally coupled resonance circuit in which a plurality of resonators are vertically coupled. .
  • the demultiplexing circuit 72 having such a configuration, for example, a demultiplexing circuit corresponding to the communication band Band28 of 3GPP2 of the above-described communication standard can be realized.
  • the transmission filter 721 of the demultiplexing circuit 72 makes the communication band Band28B (corresponding to the second communication band) by making the terminal PSW0 and terminal PSW1 (corresponding to the first selected terminal) conductive in the switch 51.
  • the filter characteristic for is realized.
  • the transmission filter 722 realizes filter characteristics for the communication band Band 28A (corresponding to the first communication band) by conducting the terminal PSW0 and the terminal PSW2 (corresponding to the second selected terminal) in the switch 51.
  • FIG. 17 is a graph showing the filter characteristics of the transmission filter of the branching circuit according to the seventh embodiment of the present invention.
  • two attenuation poles can be formed on the low frequency side of the communication band Band 28B. Thereby, the regulation of spurious emission of “NS17” can be satisfied.
  • FIG. 18 is a circuit diagram of a branching circuit according to the eighth embodiment of the present invention.
  • the branching circuit 72A according to the present embodiment is different from the branching circuit 72 according to the seventh embodiment in the configuration of the transmission filter 721A.
  • the other configuration of the branching circuit 72A is the same as that of the branching circuit 72 according to the seventh embodiment, and the description of the same part is omitted.
  • the demultiplexing circuit 72A includes a transmission filter 721A.
  • the transmission filter 721A includes a composite circuit 7211 and the high frequency filter 10B, and is a circuit in which these are connected in series.
  • the composite circuit 721 includes a ladder-type resonance circuit portion and a longitudinally-coupled resonance circuit portion.
  • FIG. 19 is a functional block diagram of a communication device according to the ninth embodiment of the present invention.
  • the communication device 80 includes a front end circuit 70 and an RFIC 81.
  • the front end circuit 70 includes a transmission side amplification circuit 71, a branching circuit 72, an antenna matching circuit 73, and a reception side amplifier 74.
  • the demultiplexing circuit 72 includes a transmission filter 721 and a reception filter 722.
  • the transmission filter 721 and the reception filter 722 are connected to the antenna matching circuit 73, and the antenna matching circuit 73 is connected to the antenna ANT.
  • the transmission filter 721 is connected to the transmission side amplification circuit 71.
  • the reception filter 72 is connected to the reception side amplification circuit 72.
  • the transmission side amplification circuit 71 and the reception side amplification circuit 72 are connected to the RFIC 81.
  • the RFIC 81 generates a transmission signal using the frequency band of the designated communication band.
  • the RFIC 81 outputs a switch control signal to the transmission filter 721 and the reception filter 722 of the branching circuit 72 according to the designated communication band.
  • the transmission filter 721 and the reception filter 722 are formed by the high frequency filters shown in the above-described embodiments, and perform switch control according to the switch control signal.
  • the transmission signal output from the RFIC 81 is amplified by the transmission side amplification circuit 71.
  • the transmission side amplification circuit 71 includes a PA and the like, and amplifies the transmission signal.
  • the amplified transmission signal is input to the transmission filter 721 of the branching circuit 72.
  • the transmission signal is filtered by the transmission filter 721 and output to the antenna ANT via the antenna matching circuit 73.
  • transmission filter 721 with the above-described configuration of the high-frequency filter, transmission is performed according to each communication band regardless of whether the designated communication band is the communication band B28A or the communication band B28B.
  • Signals can be transmitted with low loss, and unwanted waves such as harmonics generated in the transmission side amplification circuit 71 can be reliably attenuated. As a result, unnecessary high frequency signals are not transmitted to the outside in communication bands other than the designated communication band, and spurious emission regulations can be satisfied.
  • the reception signal received by the antenna ANT is input to the reception filter 722 of the branching circuit 72 via the antenna matching circuit 73.
  • the reception filter 722 filters the reception signal and outputs it to the reception side amplification circuit 74.
  • the reception side amplification circuit 44 includes an LNA and the like, amplifies the reception signal, and outputs the amplified signal to the RFIC 81.
  • each above-mentioned embodiment is a part for implement
  • the present invention is not limited to the above-described embodiments, and any configuration that switches the function of the inductor that configures the filter circuit by using a switch that is used for switching the combination of the resonators that configure the filter circuit. And the effects of the present invention can be realized.
  • 10, 10A, 10B, 10C, 10D, 10E high frequency filters 21, 22, 31, 32: resonators 41, 42, 43: inductor 51: switch 61, 63: capacitor 70: front end circuit 71: transmission side amplification Circuit 72: Demultiplexing circuit 73: Antenna matching circuit 74: Reception side amplification circuit 81: RFIC 721: transmission filter 722: reception filter ANT: antenna P1: first input / output terminal P2: second input / output terminals PSW0, PSW1, PSW2: terminals of the switch 51

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Filters And Equalizers (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Transceivers (AREA)
PCT/JP2016/060131 2015-03-30 2016-03-29 高周波フィルタ、フロントエンド回路、および通信機器 WO2016158953A1 (ja)

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JP2017510024A JP6390787B2 (ja) 2015-03-30 2016-03-29 高周波フィルタ、フロントエンド回路、および通信機器
KR1020177027529A KR101980033B1 (ko) 2015-03-30 2016-03-29 고주파 필터, 프론트 엔드 회로, 및 통신 기기
CN201680019351.4A CN107408937B (zh) 2015-03-30 2016-03-29 高频率滤波器、前端电路以及通信设备
US15/718,330 US10200012B2 (en) 2015-03-30 2017-09-28 High-frequency filter, front-end circuit, and communication apparatus

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US20180019731A1 (en) 2018-01-18
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US10200012B2 (en) 2019-02-05
JP6390787B2 (ja) 2018-09-19
CN107408937A (zh) 2017-11-28
CN107408937B (zh) 2020-09-25

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